Question

factorise X square + 4 x minus 7​

Answer 1

Answer:

The first term is, x2 its coefficient is 1 .

The middle term is, +4x its coefficient is 4 .

The last term, "the constant", is +7

Step-1 : Multiply the coefficient of the first term by the constant 1 • 7 = 7

Step-2 : Find two factors of 7 whose sum equals the coefficient of the middle term, which is 4 .

-7 + -1 = -8

-1 + -7 = -8

1 + 7 = 8

7 + 1 = 8

Observation : No two such factors can be found !!